Update redux requirement from ^4.0.0 to ^4.0.4 in /docs (#34)

Updates the requirements on [redux](https://github.com/reduxjs/redux) to permit the latest version.
- [Release notes](https://github.com/reduxjs/redux/releases)
- [Changelog](https://github.com/reduxjs/redux/blob/master/CHANGELOG.md)
- [Commits](reduxjs/redux@v4.0.0...v4.0.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

docs/package.json

@@ -84,7 +84,7 @@
     "react-window": "^1.7.1",
     "recast": "^0.17.0",
     "recharts": "^1.1.0",
-    "redux": "^4.0.0",
+    "redux": "^4.0.4",
     "redux-logger": "^3.0.6",
     "styled-components": "^4.1.1",
     "typescript-to-proptypes": "^1.1.0",